I have watched many of your videos and it's very interesting to see the Japanese take on RVing as a viewer more familiar with American RVing. I see you testing a RV portable AC in two different RVs with different power stations. My observation is that you were testing them in lower humidity environments as seen from the humidity percentage indications from your thermometers in the video and your inability to collect condensation from the test runs. The role of ACs is not just removing heat but also removing moisture from the conditioned space. When it is hot and muggy, your body's ability to cool by sweating is diminished as evaporation cannot really take place to cool you down. I think you will see very different performance with the portable AC unit if you run your tests in hot and humid conditions. The AC unit has to work hard to remove moisture in this case too. Frankly, I believe that buying a RV with no air conditioning is a mistake. I feel like the portable AC solution shown here is very un-elegant and unwieldy. Given how space is already a premium in Japanese RVs, the last thing I would want to add is another relatively bulky unit inside the RV along with the ducts that need to be routed to unsecured openings. I guess this is not a really a problem in Japan with it's low crime rate. I see that in many of your videos that you use power stations for much of your power needs in the RV. Do most Japanese RVs not have house batteries, inverters, power hookups? I've never seen you park at a RV stop with hook ups and use them. Do you have a video that explains why this is?
Try using it with EcoFlows own batteries like the EcoFlow Delta Pro or Max and directly connect it DC power to it and you will get more than 10 to 12 hours of use out of it